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n. pl. memento mori
1. A reminder of death or mortality, especially a death's-head.
2. A reminder of human failures or errors.
[New Latin mementō morī, be mindful of dying : Latin mementō, sing. imperative of meminisse, to remember + Latin morī, to die.]
(Literary & Literary Critical Terms) an object, such as a skull, intended to remind people of the inevitability of death
[C16: Latin: remember you must die]
memen′to mo′ri(ˈmɔr aɪ, ˈmoʊr aɪ, ˈmɔr i, ˈmoʊr i)
n., pl. memento mori.
an object, as a skull, serving as a reminder of death.
[1585–95; < Latin mementō morī remember (that you must) die]
A Latin phrase meaning remember you must die, used to mean an object that reminds you of your mortality, such as a skull.